tonight, the latest turn in the cia sex scandal, as we learn the identity of the fbi agent who sparked the investigation that brought down one of the nation's most powerful leaders, and is now implicated another. president obama himself spoke out today for the first time since the scandal broke, and my co-anchor terry moran has the latest. >> ladies and gentlemen, the president of the united states. >> reporter: as president obama sauntered into the east room of the white house for his post-victory news conference, the scandal that's engulfed the highest levels of his national security team still swirled around him. tonight, abc news has learned the identity of the fbi agent who ignited the whole staggering chain of events. fredrik humphreys, a 47-year-old fbi veteran who is active in counterterrorism cases, is friends with tampa socialite jill kelley who turned to him when she got some harassing e-mails. meanwhile, in washington, paula broadwell, petraeus' former mistress, who allegedly sent the e-mails to kelley, remained in hiding at her brother's home. today, the fbi said she illeg